<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
            border: none;
        }

        .demo {
            margin: 16px;
        }

        .keyword {
            width: 600px;
            height: 40px;
            font-size: 16px;
            padding: 0;
            border: 2px solid #AAAAAA;
            border-top-left-radius: 10px;
            border-bottom-left-radius: 10px;
        }
        .keyword:hover {border: 2px solid #F0F0F0;}
        .keyword:focus {border: 2px solid #AAAAAA;}

        .submit {
            margin-left: -4px;
            margin-top: 2px;
            font-size: 16px;
            font: 1.5em"宋体";
            color: #FFFFFF;
            height: 42px;
            border: none;
            background: #4e6ef2;
            border: #F0F0F0;
            padding: 0 24px;
            border-top-right-radius: 16px;
            border-bottom-right-radius: 10px;
        }

        .submit:hover {
            background: #2A4AA0;
        }

        img {
            left: 590px;
            top:30px;
            witch: 15px;
            height: 15px;
            position: absolute;
        }
    </style>
</head>
<body>
<div class="demo">
    <input type="text" class="keyword" >
    <button class="submit">百度一下</button>
    <img src="bg.jpg">
</div>
</body>
</html>